Seat large-angle reclining linkage structure

Abstract

This invention discloses a large-angle tilting linkage structure for a chair, comprising: a chassis, on which a seat is slidably mounted; a backrest bracket, fixedly connected to the chassis; and a chair back, the middle of which is rotatably mounted to the backrest bracket, and the bottom of which is rotatably mounted to the seat, to drive the seat to slide horizontally along a side facing or away from the backrest bracket. A soft rubber component is disposed between the chair back and the backrest bracket, located on the rotation path of the chair back, with one end abutting against the chair back and the other end abutting against the backrest bracket. By rotatably mounting the chair back to the seat, the seat has relatively low rotational rigidity, allowing the chair back to rotate backward when the user leans back. The soft rubber component on the rotation path of the chair back, abutting against both the chair back and the backrest bracket, cushions the backward rotation of the chair back, thus making the user more comfortable when leaning back. Furthermore, the backward rotation of the chair back causes the seat to slide forward, creating a larger angle based on the chassis, allowing for a greater range of backward leaning and more comfortable seating.

Description

Technical Field

[0001] This invention relates to the field of chair technology, and in particular to a large-angle tilting linkage structure for chairs. Background Technology

[0002] In some related technologies, the seat has a backrest for the occupant to lean back. In others, the backrest is attached to the seat, and the occupant leans back using their own weight. Because the backrest has high rigidity when rotating backward, a large force is required to tilt it back, resulting in poor comfort. In still others, the occupant needs to operate the chassis to tilt the backrest, which is cumbersome. Furthermore, the angle between the backrest and the chassis is small, resulting in a small backrest tilt angle and further reducing occupant comfort. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a large-angle tilt linkage structure for a seat. This structure causes the seat back to tilt when the user's back is against the seat, and furthermore, by using a fulcrum to deform the soft rubber parts and slide the seat forward, a larger angle is generated based on the chassis, making the seating more comfortable.

[0004] The seat large-angle tilt linkage structure according to an embodiment of the present invention includes:

[0005] The chassis is slidably equipped with a seat;

[0006] The back support is fixedly connected to the chassis.

[0007] The chair back is rotatably mounted to the back support at its center and rotatably mounted to the seat at its bottom, so as to drive the seat to slide horizontally along a side facing or away from the back support. A soft rubber component is provided between the chair back and the back support, and the soft rubber component is located on the rotation path of the chair back. One end of the soft rubber component abuts against the chair back and the other end abuts against the back support.

[0008] The seat large-angle tilt linkage structure according to an embodiment of the present invention has at least the following beneficial effects: the backrest is rotatably mounted on the seat, the seat has low rotational rigidity, and when the occupant leans back, it can drive the backrest to rotate backward. Soft rubber parts are provided along the rotation path of the backrest, and these soft rubber parts abut against the backrest and the back support respectively, which can buffer the backward rotation of the backrest. Therefore, the occupant's backward use is more comfortable. Furthermore, when the backrest rotates backward, it drives the seat to slide forward, generating a larger angle based on the chassis, allowing the occupant to lean back more and making the backward sitting more comfortable.

[0009] According to the large-angle tilt linkage structure of the seat according to the present invention, the chassis is equipped with a compression spring, one end of the compression spring is connected to the chassis and the other end is connected to the seat, so as to drive the seat to move along the side facing the back support.

[0010] According to the large-angle tilt linkage structure of the seat according to the present invention, the seat is equipped with an extension plate, the two ends of the extension plate extend into the seat and the backrest respectively, and the two ends of the extension plate are respectively provided with a first rotating shaft and a second rotating shaft, the first rotating shaft being rotatably disposed on the seat and the second rotating shaft being rotatably disposed on the backrest.

[0011] According to the large-angle tilt linkage structure of the seat of the present invention, the seat is provided with a first hinge seat that cooperates with the first rotating shaft, the bottom of the backrest is provided with an interconnected mounting groove and a rotating groove, a portion of the extension plate extends into the mounting groove, and the second rotating shaft is rotatably disposed in the rotating groove.

[0012] According to the large-angle tilt linkage structure of the seat according to the present invention, a first connecting plate is provided between the seat and the chassis, the seat is slidably disposed on the first connecting plate, and both ends of the first connecting plate are hinged to the chassis and form a planar linkage mechanism with the chassis.

[0013] According to the large-angle tilt linkage structure of the seat according to the present invention, a second connecting plate is further provided between the seat and the first connecting plate. One of the second connecting plate and the first connecting plate is provided with a strip-shaped limiting groove, and the other is equipped with a limiting post. The limiting post is slidably disposed in the limiting groove.

[0014] According to the large-angle tilt linkage structure of the seat according to the present invention, a connecting seat is installed on the side of the backrest facing the seat, and a second hinge seat is provided on the top of the backrest support. The connecting seat and the second hinge seat are connected by a rotating shaft.

[0015] According to the large-angle tilt linkage structure of the seat according to the present invention, the connecting seat and the backrest are further provided with two buffer columns. The two buffer columns are arranged at intervals along the center line parallel to the rotation axis, and the two ends of the buffer columns abut against the connecting seat and the backrest respectively.

[0016] According to the large-angle tilt linkage structure of the seat according to the present invention, the backrest includes a first back frame and a second back frame. The first back frame is located above the second back frame. The bottom of the first back frame is connected to the back support. A lumbar support is provided on the side of the second back frame facing the center of the seat. The lumbar support is vertically adjustable and installed on the second back frame.

[0017] According to the large-angle tilt linkage structure of the seat according to the present invention, a first arc-shaped plate and a second arc-shaped plate are sequentially installed on the side of the second back frame facing the center of the seat. The first arc-shaped plate is provided with a strip groove extending in the vertical direction. The lumbar support is connected to an adjustment block. The adjustment block is slidably disposed in the strip groove and engages with the first arc-shaped plate in a step-locking manner. The second arc-shaped plate passes through the lumbar support and is used to guide the vertical movement of the lumbar support.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a structural diagram of a chair that is applied to the large-angle tilt linkage structure of the seat in an embodiment of the present invention;

[0021] Figure 2 This is a first exploded view of the backrest connection structure of the seat large-angle tilt linkage structure in some embodiments of the present invention;

[0022] Figure 3 This is a second exploded view of the backrest connection structure of the seat large-angle tilt linkage structure in some embodiments of the present invention;

[0023] Figure 4 This is a first exploded view of the second back frame connection structure of the seat large-angle tilt linkage structure in some embodiments of the present invention;

[0024] Figure 5 This is a schematic diagram of the seat portion of the seat's large-angle tilt linkage structure in some embodiments of the present invention;

[0025] Figure 6 This is an exploded view of the seat connection structure of the large-angle tilt linkage structure of the seat in some embodiments of the present invention;

[0026] Figure 7 This is a second exploded view of the second back frame connection structure of the seat large-angle tilt linkage structure in some embodiments of the present invention.

[0027] Explanation of icon numbers:

[0028] Back support 100; second insertion slot 101; soft rubber part 110; deformation groove 1101; first insertion part 111; second insertion part 112; connecting seat 120; second hinge seat 130; rotating shaft 131;

[0029] Seat 200; First hinge seat 210;

[0030] Chair back 300; first back frame 310; first insertion slot 3101; buffer post 311; second back frame 320; mounting slot 3201; rotating slot 3202; first arc plate 321; strip groove 3211; snap-fit ​​slot 3212; second arc plate 322; lumbar support 323; adjusting block 330;

[0031] Fixed plate 410; extension plate 420; first rotating shaft 421; second rotating shaft 422;

[0032] Chassis 500; First connecting plate 510; First limiting groove 511; Second connecting plate 520; Second limiting groove 521; Compression spring 530; First limiting post 540; Second limiting post 550; First round rod 560; Second round rod 570. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] In some related technologies, the seat has a backrest for the occupant to lean back. In others, the backrest is attached to the seat, and the occupant leans back using their own weight. Because the backrest has high rigidity when rotating backward, a large force is required to tilt it back, resulting in poor comfort. In still others, the occupant needs to operate the chassis to tilt the backrest, which is cumbersome. Furthermore, the angle between the backrest and the chassis is small, resulting in a small backrest tilt angle and further reducing occupant comfort.

[0039] Therefore, such as Figures 1 to 3 , Figure 5 and Figure 6As shown, the large-angle tilt linkage structure of the seat proposed in this invention includes a chassis 500, a back support 100, a backrest 300, and a seat 200. The seat 200 is slidably disposed on the chassis 500, the back support 100 is fixedly connected to the chassis 500, the middle part of the backrest 300 is rotatably mounted on the back support 100, and the bottom of the backrest 300 is rotatably mounted on the seat 200, thereby driving the seat 200 to slide horizontally along a side facing or away from the back support 100. Further, a soft rubber component 110 is provided between the backrest 300 and the back support 100. The soft rubber component 110 is located on the rotation path of the backrest 300, with one end abutting against the backrest 300 and the other end abutting against the back support 100. It should be noted that the chair back 300 is rotatably mounted on the chair seat 200. The chair seat 200 has relatively low rotational rigidity, allowing the chair back 300 to rotate backward when the user leans back. A soft rubber component 110 is provided along the rotation path of the chair back 300, abutting against both the chair back 300 and the back support 100, thus cushioning the backward rotation of the chair back 300. This makes leaning back more comfortable for the user. Furthermore, the backward rotation of the chair back 300 causes the chair seat 200 to slide forward, creating a larger angle than the chassis 500, resulting in a greater range of backward leaning and greater comfort. In some embodiments, the chair seat 200 is connected to a fixed plate 410 and an extension plate 420. The chair seat 200 is fixedly connected to the back support 100 via the fixed plate 410, and rotatably connected to the chair back 300 via the extension plate 420. Specifically, one end of the fixing plate 410 is fixed to the seat 200, and the other end is fixed to the back support 100; the two ends of the extension plate 420 are respectively provided with a first rotating shaft 421 and a second rotating shaft 422, the first rotating shaft 421 being rotatably connected to the seat 200, and the second rotating shaft 422 being rotatably connected to the backrest 300. In some embodiments, the seat 200 is provided with a first hinge seat 210 that cooperates with the first rotating shaft 421, and then referring to... Figure 7 The bottom of the chair back 300 is provided with an interconnected mounting groove 3201 and a rotating groove 3202. A portion of the extension plate 420 extends into the mounting groove 3201, and the second rotating shaft 422 is rotatably disposed in the rotating groove 3202. It should be noted that by providing the extension plate 420, the chair back 300 can be connected to a greater distance behind the seat 200. Furthermore, the first rotating shaft 421, the second rotating shaft 422, and the extension plate 420 are integrally formed. Through the rotatable connection between the first rotating shaft 421 and the seat 200, the connection between the second rotating shaft 422 and the chair back 300, and the extension plate 420 extending into the chair back 300, the linkage between the chair back 300 and the seat 200 is achieved.

[0040] In some embodiments of the present invention, such as Figure 2 and Figure 3As shown, the chair back 300 includes a first back frame 310 and a second back frame 320. The first back frame 310 is located above the second back frame 320, and its bottom is connected to the back support 100. The second back frame 320 is mounted on the first back frame 310. The top of the second back frame 320 has a protrusion, and the bottom of the first back frame 310 has a corresponding groove, with the protrusion and groove engaging. Furthermore, the bottom of the second back frame 320 is rotatably connected to the second rotating shaft 422 of the extension plate 420. It is easy to understand that dividing the chair back 300 into upper and lower frames effectively reduces the volume of the packaging box required for product disassembly and packaging, thus lowering transportation costs. In some embodiments, the middle part of the chair back 300, i.e., the connection between the first back frame 310 and the second back frame 320, is rotatably connected to the back support 100. For example, the rotatable connection between the first back frame 310 and the back support 100 can further increase the rotation angle of the chair back 300. For instance, when the user's head tilts back, the first back frame 310 can also rotate slightly backward, further improving the user's seating comfort. In some embodiments of the present invention, the first back frame 310 and the back support 100 are designed with a hidden pivot point, resulting in a better overall appearance. Specifically, a connecting seat 120 is installed on the side of the first back frame 310 facing the seat 200. The connecting seat 120 is located at the bottom of the first back frame 310, and a second hinge seat 130 is provided at the top of the back support 100. The connecting seat 120 and the second hinge seat 130 are connected by a pivot 131. Furthermore, the pivot 131 is located inside the connecting seat 120 and is not easily noticeable.

[0041] In some embodiments of the present invention, such as Figure 2 and Figure 3 As shown, the two ends of the soft rubber component 110 are respectively inserted into the first back frame 310 and the back support 100, making the installation more stable. Furthermore, the soft rubber component 110 is located on the side of the connecting seat 120 away from the seat 200. When the first back frame 310 rotates backward, the soft rubber component 110 deforms, cushioning the rotation of the first back frame 310 and further improving the comfort of the user. Specifically, one end of the soft rubber component 110 is provided with a first insertion part 111, and the other end is provided with a second insertion part 112. The first back frame 310 has a first insertion groove 3101 that matches the shape of the first insertion part 111, and the back support 100 has a second insertion groove 101 that matches the shape of the second insertion part 112. The soft rubber component 110 is inserted into both ends, making the installation more stable. Furthermore, a deformation groove 1101 is provided on the side of the soft rubber part 110 away from the seat 200, which facilitates the deformation of the soft rubber part 110 when the first back frame 310 rotates backward, by pressing against the soft rubber part 110. Optionally, the soft rubber part 110 is made of rubber, which has good elasticity and durability.

[0042] In some embodiments of the present invention, such as Figure 2 and Figure 3As shown, a buffer post 311 is provided between the connecting seat 120 and the first back frame 310, with both ends of the buffer post 311 abutting against the connecting seat 120 and the chair back 300, respectively. In addition to the soft rubber part 110 providing cushioning for the rotation between the first back frame 310 and the back support 100, the buffer post 311 provides cushioning for the connection between the first back frame 310 and the connecting seat 120. For example, the soft rubber part 110 is arranged vertically, and the buffer post 311 is arranged horizontally, which can better cushion the movement of the first back frame 310, making the rotation of the first back frame 310 smoother and the user more comfortable. Furthermore, there are two buffer posts 311, spaced apart along a direction parallel to the center line of the rotating shaft 131, enabling the chair back 300 to have a left-right tilting function. In some embodiments, the two buffer posts 311 serve as support points; when a person leans back on the chair back 300, the first back frame 310 can rotate left and right at a certain angle due to the person's own weight, making the user more comfortable.

[0043] like Figure 3 and Figure 4 As shown, in some embodiments of the present invention, a lumbar support 323 is provided on the side of the second back frame 320 facing the center of the seat 200, which can support the lumbar region of the sitter and prevent lumbar pain from prolonged sitting. Furthermore, the lumbar support 323 is vertically adjustable on the second back frame 320, allowing it to be adjusted according to the sitter's needs, thus improving its applicability. In some embodiments, a first arc-shaped plate 321 and a second arc-shaped plate 322 are sequentially installed on the side of the second back frame 320 facing the center of the seat 200. The first arc-shaped plate 321 has a vertically extending strip groove 3211. The lumbar support 323 is connected to an adjusting block 330, which is slidably disposed in the strip groove 3211 and engages with the first arc-shaped plate 321 in a step-locking manner. The second arc-shaped plate 322 passes through the lumbar support 323 and guides the vertical movement of the lumbar support 323. Specifically, some adjustment blocks 330 are inserted into and fixed to the lumbar support 323 via strip grooves 3211. The sidewalls of the strip grooves 3211 are provided with multiple locking slots 3212 equidistantly arranged in the vertical direction. The adjustment blocks 330 engage with the locking slots 3212 to adjust the height of the lumbar support 323 equidistantly in the vertical direction. It should be noted that the first arc-shaped plate 321 has a streamlined design that conforms to the curve of the human waist, and the strip grooves 3211 extend along the arc of the first arc-shaped plate 321. In addition, the second arc-shaped plate 322, besides guiding the lumbar support 323, also functions as a reinforcing rib, enhancing the rigidity of the connection between the lumbar support 323 and the first arc-shaped plate 321. Furthermore, the lumbar support 323, via the second arc-shaped plate 322, allows for more flexible design, enabling it to be designed to better conform to the curve of the human waist, providing more comfortable lumbar support. Furthermore, the lumbar support 323 and the second arc-shaped plate 322 are both provided with multiple strip-shaped heat dissipation grooves, which correspond to the strip-shaped grooves 3211 of the first arc-shaped plate 321, making the overall appearance of the product better.

[0044] In some embodiments of the present invention, such as Figure 5 and Figure 6 As shown, a compression spring 530 is installed on the chassis 500. One end of the compression spring 530 is connected to the chassis 500, and the other end is connected to the seat 200 to drive the seat 200 to move along the side facing the back support 100. Thus, when the seat 200 is in its natural state, the seat 200 retracts inward to return to its original position and does not protrude outward to take up space. Furthermore, it is adapted to the compression spring 530 when the occupant leans back and the seat 200 slides forward to stretch the compression spring 530.

[0045] In some embodiments of the present invention, such as Figure 6 As shown, a first connecting plate 510 and a second connecting plate 520 are provided between the seat 200 and the chassis 500. One end of a compression spring 530 is connected to the side of the first connecting plate 510 facing the backrest 300, and the other end is connected to a screw (not shown) fixed to the second connecting plate 520 to drive the second connecting plate 520 to move towards the backrest 300. Specifically, the first connecting plate 510 is connected to the chassis 500, and the second connecting plate 520 is fixedly connected to the seat 200. The first connecting plate 510 and the second connecting plate 520 slide in a horizontal direction, thereby allowing the seat 200 to move towards or away from the backrest 300. Further, one of the second connecting plate 520 and the first connecting plate 510 is provided with a strip-shaped limiting groove, and the other is equipped with a limiting post. The limiting post is slidably disposed in the limiting groove, which can guide the sliding of the second connecting plate 520 and prevent the second connecting plate 520 from sliding out. For example, the end face of the first connecting plate 510 is provided with a first limiting groove 511, and the second connecting plate 520 is equipped with a first limiting post 540 corresponding to the first limiting groove 511, the first limiting post 540 being slidably disposed in the first limiting groove 511. As another example, the end face of the second connecting plate 520 is provided with a second limiting groove 521, and the first connecting plate 510 is equipped with a second limiting post 550 corresponding to the second limiting groove 521, the second limiting post 550 being slidably disposed in the second limiting groove 521.

[0046] In a further embodiment of the present invention, such as Figure 6As shown, both ends of the first connecting plate 510 are hinged to the chassis 500, forming a planar linkage mechanism with the chassis 500. Referring to the characteristics of linkage motion, when the user drives the first connecting plate 510 to slide, the first connecting plate 510 can tilt relative to the horizontal plane and form a certain angle, resulting in greater flexibility of the seat 200 and greater comfort for the user. For example, when the chair tilts at a large angle, the seat 200 can also tilt at a large angle relative to the horizontal plane to better support the user and improve comfort. In some embodiments, a first round rod 560 and a second round rod 570 are rotatably mounted on both ends of the first connecting plate 510, and a first rotating plate and a second rotating plate are rotatably mounted on both ends of the chassis 500. The end of the first rotating plate facing away from the chassis 500 is hinged to the first round rod 560, and the end of the second rotating plate facing away from the chassis 500 is hinged to the second round rod 570. At this point, referring to the connecting mechanism, the first rotating plate and the second rotating plate can act as cranks, and the first connecting plate 510 can act as a connecting rod. In some embodiments, the distance between two rotation axis points in the first rotating plate is equal to the distance between two rotation axis points in the second rotating plate. In this case, the chassis 500, the first rotating plate, the second rotating plate, and the first connecting plate 510 together form a parallelogram mechanism, and the first connecting plate 510 can translate relative to the horizontal plane. In some embodiments, the distance between two rotation axis points in the first rotating plate is not equal to the distance between two rotation axis points in the second rotating plate. In this case, the first connecting plate 510 can rotate relative to the horizontal plane.

[0047] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A linkage structure for large angle reclining of a seat, characterized by, include: The chassis is slidably equipped with a seat; The back support is fixedly connected to the chassis. The chair back is rotatably mounted to the back support at its middle part and rotatably mounted to the seat at its bottom so as to drive the seat to slide horizontally along a side facing or away from the back support. A soft rubber part is provided between the chair back and the back support. The soft rubber part is located on the rotation path of the chair back. One end of the soft rubber part abuts against the chair back and the other end abuts against the back support. The chair back includes a first back frame and a second back frame. The first back frame is located above the second back frame, and the bottom of the first back frame is rotatably connected to the back support. When the first back frame rotates backward, the soft rubber part deforms, which can buffer the rotation of the first back frame and increase the rotation angle of the first back frame. The chair seat is equipped with an extension plate, the top of the second back frame is connected to the first back frame, and the bottom of the second back frame is rotatably connected to the extension plate to drive the chair seat to slide. The two ends of the extension plate extend into the chair seat and the second back frame, respectively. The two ends of the extension plate are respectively provided with a first rotating shaft and a second rotating shaft. The first rotating shaft is rotatably mounted on the chair seat, and the second rotating shaft is rotatably mounted on the second back frame. A connecting seat is installed on the side of the first back frame facing the seat, and a second hinge seat is provided on the top of the back support. The connecting seat and the second hinge seat are connected by a pivot. Two buffer posts are also provided between the connecting seat and the first back frame. The two buffer posts are arranged at intervals along a direction parallel to the center line of the rotating shaft, and the two ends of the buffer posts abut against the connecting seat and the first back frame, respectively.

2. The large angle recline linkage of claim 1, wherein: The chassis is equipped with a compression spring, one end of which is connected to the chassis and the other end of which is connected to the seat, so as to drive the seat to move along the side facing the back support.

3. The seat large-angle tilt linkage structure according to claim 1, characterized in that: The chair seat is provided with a first hinge seat that cooperates with the first rotating shaft. The bottom of the second back frame is provided with an interconnected mounting groove and a rotating groove. Part of the extension plate extends into the mounting groove, and the second rotating shaft is rotatably disposed in the rotating groove.

4. The seat large-angle tilt linkage structure according to claim 1, characterized in that: A first connecting plate is provided between the seat and the chassis. The seat is slidably disposed on the first connecting plate. Both ends of the first connecting plate are hinged to the chassis and form a planar linkage mechanism with the chassis.

5. The seat large-angle tilt linkage structure according to claim 4, characterized in that: A second connecting plate is also provided between the chair seat and the first connecting plate. One of the second connecting plate and the first connecting plate is provided with a strip-shaped limiting groove, and the other is equipped with a limiting post. The limiting post is slidably disposed in the limiting groove.

6. The seat large-angle tilt linkage structure according to claim 1 or 3, characterized in that: A lumbar support is provided on the side of the second back frame facing the center of the seat, and the lumbar support is vertically adjustable and installed on the second back frame.

7. The seat large-angle tilt linkage structure according to claim 6, characterized in that: The second back frame is sequentially equipped with a first arc plate and a second arc plate on the side facing the center of the seat. The first arc plate is provided with a strip groove extending in the vertical direction. The lumbar support is connected to an adjustment block. The adjustment block is slidably disposed in the strip groove and engages with the first arc plate in a step-locking manner. The second arc plate passes through the lumbar support and is used to guide the vertical movement of the lumbar support.

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